by Herbert S. Denenberg ... [et al.]
Prentice-Hall, 1964
Buku Teks
Athern, James L.
West , 1989
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Sari Viciawati Machdum
P3DI Setjen DPR RI, 2015
UI - Makalah dan Kertas Kerja
Hammond, J.D.
Foresman and Company, 1968
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Seal, Hilary L.
John Wiley & Sons, 1978
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